The unintentional ejaculation of a bead of seminal fluid inside ones' under garments.
Your typical ‘Mozzarella Moment’ occurs when a male comes across a fine female specimen who he finds particularly poignant. Given that the scenario does not involve prolonged sexual arousal, only a tiny bead of love-milk escapes the male, resulting in a minuscule hot mess.
The semen discharge resembles the minute drip of fresh coagulated milk that is seen escaping from fresh mozzarella when pressure is applied using a fork, or any other form of silverware.
Dude, I had a mozzarella moment while watching my hot colleague drinking a glass of cold water.